I'm super glad a version of this track exists out there. It's local to me and ridiculously fun. I went to an event there recently and I can confirm that the layout here is really damn close to spot-on.
There are a few things that I think could be better (I assume this is a WIP as it's not at 1.0 yet):
-AI freaks out at some points (particularly on the first lap) and has an unusual tendency to go completely onto the grass, for instance on the exit to the last corner (this is with the Kunos MX-5 Cup)
-I feel like the grass surface is too similar to the tarmac at the moment and feels more like a cosmetic feature than actual grass
-I wish there was an official reverse layout as IIRC Palmer does events in both directions
-From IRL experience, at the topmost point of the track, one should have a pretty distant view of the surrounding hills, but this version does not have that
-IRL the track isn't quite this smooth
It's no 5-star LilSki or Fat Alfie track of course but I think it has great potential, it's ridiculously fun (especially with the Cup Miata), and I'd love to see it developed in the future